Advertising on these mobile web pages ensures that the ads are viewed by those using mobile devices. Usually, if clicked, these ads will take the viewer to the mobile optimised page of the advertiser. Companies like Google, Yahoo, and Microsoft are among the largest companies selling advertising space on their mobile content pages, specifically on their search pages.
A location-based service is one that allows an advertiser to send advertisements or other information to a mobile device based on its physical location email list. Location based services are offered by cell phone networks which are able to track the general location of a mobile phone user through the process of triangulation. If the mobile phone user has their GPS system turned on, that will also serve to identify their location in a much more specific way.
Once the network is able to find out where the user is, the advertiser can send out an ad-based on that location. For example, if someone is walking down a street with a Starbucks on the corner, the location-based service can recognize that the person is near a Starbucks and send them an advertisement for the store. A more passive version of this is to locate a physical base station in a specific location.